Seresto Flea Collar for Dogs Review

A Flea Collar That Fights Both Fleas and Ticks?

There are several different methods for getting fleas and ticks to leave your dog alone, but which one is the best?

We’re going to take a look at the ingredients, warnings, and share information from other users, so you will know exactly how well the product worked for other and what you can expect when you make your purchase.

Company Claims

Seresto Flea Collar for Dogs will do two different things. It will repel fleas and ticks and will kill any currently living on your dog. It does take up to 48 hours for the toxin to spread over your pet, so any ticks should be removed by hand.

The flea collar will last for up to 8 months and will repel both fleas and ticks for the entire time. It is water resistant and will continue to release medication even if it gets wet or dirty. It is odor-free and will not cause harm to your pet, even if they manage to chew on the collar.

Active Ingredients

Seresto Flea Collar for Dogs has two active ingredients:

Imidacloprid

Flumethrin

How this ingredient works

Imidacloprid acts as a neurotoxin in insects, causing them to lose control of their central nervous system. This leads to paralysis and eventual death. It is also slightly toxic to mammals and should only be used on the outside of your dog. It is one of the most widely used insecticides in the world but it is considered moderately toxic when ingested orally.

Flumethrin is similar to Imidacloprid except that it was developed to work on tick instead of fleas. It is nontoxic to mammals and did not show any adverse effects in any of its laboratory studies. It is used in this situation because it also neutralizes the adverse effects from ingesting the previous medication.

Usage Information

The Seresto Flea Collar for Dogs is easy to use. All you do is remove the collar from the bag and place it around the dog’s neck. Adjust the tightness of the collar until two fingers can be inserted under the band.

Snip off any excess collar that may stick out beyond the end of the clip. This prevents other animals from grabbing onto the collar and removing it from your dog.

The collar comes with a breakaway clip that will release if it is every caught on another obstacle. This prevents your dog from chocking on the collar and allows them to escape without harm.

What Are Users Saying

The reviews for this product are pretty terrible. Many people reported finding ticks even after the initial 48 hour waiting period. There were even reports of animals getting flea infestations after only one or two months of wearing the collar.

All of the reviews were negative regarding the effectiveness with ticks. Some animals even developed chemical burns on their necks after wearing the collar for a few days.

Side Effects and Precautions

Some of the side effects of the Seresto Flea Collar for Dogs include itchy skin, redness, swelling and intense scratching around the collar. Some dogs even had problems with red eyes after the first few days, which disappeared when the collar was removed.

Conclusion

There is no way we could recommend the Seresto Flea Collar for Dogs because, according to the people who have used the collar, it doesn’t work. Normally, a few negative reviews are expected for any product, but having only negative reviews shows that a product is probably not the best investment.

If you need to keep fleas and ticks away from your dogs, there are safer and more effective products available.

If you’ve used this product, please tell us about your experience in the comments section below.

I have been using the Seresto collar on my 12 year old and 3 1/2 year old dogs (Labradors)since June 6th 2013. In that time each dog has developed diarrhea and my older dog has been near death in the emergency vet clinic all weekend at great expense mind you with severe vomiting and diarrhea.

I’m not saying it is the Seresto collar but neither dog is known to eat foreign objects or dead animals as they are in a fenced enclosure. For precaution I am taking them off it. The similarity and timing of their symptoms is no coincidence I believe.

The same is happening to my two year old Golden Retriever. I put the collar on her two weeks ago and she started having the same symptoms. I took it off, bathe her and gave her bland diet and she returned to normal. I called bayer when this happened and they said that this couldn’t happen. There could have been other variables- berries growing in back yard that could have caused it. I waited until a few days ago and put it back on. the same symptoms started to happen again. Called Bayer back and got a refund.

thank you so much for posting this! My dog has had diarrhea for the past 2 days. He hasn’t gotten in to anything, he eats a healthy, nutritious diet, and we haven’t given him anything new/different. Then it occurred to me this morning that it may be the collar. After reading so many instances of vomiting and diarrhea, I’m convinced it has to be a side effect of the collar.

I started using this flea collar about a month ago and my 5lb Chihuahua is now a very sick dog. 3 weeks ago he had 4 very strange seizures. Strange as he’d come out of them immediately, no sluggishness, nothing. This morning he lost his bladder, his legs don’t want to hold him up and he’s not eating. He’s taking water from me through a syringe, quite a lot thank goodness. One of those chemicals used is the same used in nicotine and can cause seizures in dogs. I had him a the Vet 3 weeks ago and his physical was normal, his blood work better than normal. It stumped the doctor. Needless to say he no longer has the collar on, I’ve washed his neck with Dawn, (he got pretty annoyed with me….that’s a good thing!), and he’s resting. I’m retired, fixed income etc, so no Vet again until Monday when I get paid. The last visit was about $500 and out of money. And scared.

Look for a not for profit Spayed and Neuter clinic. They will treat your animals for so much less than a Vets Office. The clinic has volunteer vets that volunteer their time and you don’t have to pay the high prices for the same services.

You should contact the manufacturer, look for phone number on back of box or on this site. If your vet agrees that these symptoms were caused by this product, you should get reimbursed for your vet bills. It was not with this company but with another that my dog had gotten very sick from their flea medication. It took a few months, but i was reimbursed for my $400 vet bill and the supply of medication i had bought.

Oh my gosh, Cindy. I just saw your comments and now cannot help but wonder if the Seresto collar is what caused my little silky terrier to start having seizures. The last one she had she could not even walk or stand up at all for over 12 hours. The vet assured me the collar had nothing to do with it, but I am removing it now. Thank you for sharing your experience and I pray your little fella is better now.

MY chow chow bailey was not eating for 2 weeks throwing up red eyes ;weird noises at nite that woke me up could have been seizure;hair loss patches under collar blood and irritated skin;called bayers 800 number they made file and case number refund immediately from my vet glad people blog about this their reviews saved my baby!!!!bayer should remove seresto collars they are deadly!!!!!!!!!!!!!!!!!!!!

my 7 yr old American Eskimo has had two seizure, the first one only lasted a few min and wasn’t bad, the second lasted for almost 4 min. His hind legs would not support him, when I looked him in the eyes he looked so scared and when he started to come out of it he was panting like he ran a marathon. I wish I never heard of Seresto.

My 4 to 5 yr. old Pekingese had a petit mal seizure after wearing the Seresto 8 month flea/tick collar for a little over a week. Also had episodes of vomiting. My approximately 10 yr. old Pekingese also had episodes of vomiting. Have removed the flea collars! Do NOT recommend.

Put seresto collar on my 4 year old Australian cattle dog mix. With in a couple of weeks she was vehemently shaking her head. Took collar off gave bath shaking went away in a few days. Waited 1 month put collar back on same problem. She was shaking her head uncontrollably. Will not use again.

I too started using the Seresto collar on my 6 yr old sheltie, vet recommended! :(. … I removed the collar today, after only a month of use. He had become increasingly lethargic with bouts of diarrhea with weakness: I had to carry him home from a short walk today. We went through so much this past month trying to figure out what was wrong: two expensive Vet visits, food change, antiobiotics, unnecessary worming for a rare intestinal bug and now the vet wants to do a colonostomy? I actually thought my sheltie was dying …we never looked at the collar as the cause.
So, my grandson is hugging my sheltie, in an attempt to comfort him, and the side of his face swells! Time for the collar to go!!! I just wrote a letter to Bayer: asking for a refund, explaination and apology.

My friend put this collar on her rat terrier and that very night he lost control of his bladder. The next day his breathing was labored and he couldn’t stop panting. A burn developed on his neck. He was taken to the vet and the collar was removed. Almost immediately his breathing improved and he stopped panting. A few chemical burns appeared on his body which are being treated with medication. The collar was returned and a refund given. A warning label should come with this collar and vets should be responsible too.

Barbara, what medication did you use for your dog’s burns? One of my mini poodles developed a bloody rash/burn on her throat (second time this has happened after using a Seresto collar) so I removed the collar. Yet yesterday she was acting very strangely, wanting to be held, and darting around in a weird, frantic manner. Not like herself at all. I saw that some people used Dawn dish detergent to clean their dogs around the neck. I wonder what I should do about my dog’s burns at her throat. Help!

I love this product. I work at a vets office and use it on all my dogs and 1 cat. When I started using it I had a flea infestation. 1 year later I have had no problem with fleas or ticks. I have also recommended it to several clients who have dogs with FAD and it totally helped because it definitely seemed to repel the fleas BEFORE biting. Its great.

I have tried almost everything to get rid of fleas on my 3 dogs from Dawn to the flea pills. My poor senior pug was miserable and losing her fur and my two American Bullies would hide on bath day. A month ago I bought this flea collar for all three of them and I have had nothing but fantastic results.My pugs fur is growing back and the fleas are gone. I will definitely keep an eye on my dogs after reading this but for now I am going to keep using it

We are on our second collar for our six dogs, 5 cairn terriers one chi mix. Have not had any problems with fleas tick or sickness. When we bathe we take collars of until dogs are complete dry. We live in South west Georgia capital of heat, fleas and ticks. With any new product there negative results. So far we are a positive results. I feel for all those of you that have had to endure all of these side effects, I know how much our pets mean to all of us. We LOVE ours so much.

We put the Seresto flea & tick collar on our 20lb, 10-12 yr old dachshund at 7pm & by 3am she had a hacking cough. I removed the collar immediately. As the day went on she still coughed, but it had subsided a bit. Also bathed her a especially washed the area on her neck where the collar had been. Took her to the vet and spent good money as always and did get our money back for the collar. They will tell you when you call the people who make this collar that they had never heard of that side effect or any off them. My husband said “really, they’re a whole bunch of reviews on the internet” and the person he talked to said “I wonder if those are for real reviews”. No idiot, a bunch of people just went on line to bash this flea and tick collar. Geez, what moron’s!!!!

Got collar from Vet. Within 24 hours of applying, Max (80 lb Pitbull) wouldn’t eat, was lethargic, and his skin looked like an allergic reaction. He was constantly scratching he’s neck. Developed bleeding wound on neck from scratching so much. Removed collar on day 4 which is today. Benadryl seemed to help him rest earlier. He was given a long Dawn scrub shower to help remove chemicals. At first, I was thinking scabies, but now I think it’s the collar. Wish I could post pics on here. He’s appetite has already improved today. Hoping he’s skin gets better soon.

Called Bayer and explained situation. Bayer said to take collar and reference # to vet and vet will start process with them for a refund. Taking Max to vet in the morning for treatment to make sure he isn’t getting septic. Max has lost more hair on back of neck and wound is now weeping fluid. Rash is getting better and he’s eating good. Still giving Benadryl twice a day along with some old doxycycline.

My pug wore this collar for about a week. Got lots of scabs and awful itching.Give 25mg benedryl but did not cure, also skin is turning black. Going to vet Mon this has been to weeks. I will contact Bayer, maybe they will help.

Both my Husky mix have large areas of hair loss and itching since wearing the collar. Called Vet who didn’t think it could be the collar. One dog has been on Prednisone and antibiotic , to no avail. I am finally taking the collar off them and bathing in Dawn detergent . I am pretty upset by Thais given the cost.

I left my Chi/Mix and my cat for 5 days while I was in hospital, with a friend stopping by to take care of my fur kids a couple times a day. . When I got home both pets and my house was saturated with fleas, to the point that they were on my bed and on me. After trying everything, including tried and true remedies, nature made sprays and topical treatments were ineffective. I bought both cat and dog Seresto collars…in one week not much change. In checking, the collar was too loose, I tightened it and not only did all the fleas on the animals die, but also in the house! They had no reaction or discomfort with this collar. However, I adopted a senior dog this May and ordered him a Seresto collar. I applied it loose and over a period of two weeks I slowly tightened it. Now when it was as tight as recommended, he scratched and scratched at the collar, skin under it was OK – I finally removed it and he hasn’t scratched since. The other two are still wearing their collars.

This is an addendum to my previous statement…I removed all the Seresto collars, including the ones applied 5 months ago. My Chi/Mix has had stomach upset and cat seems ok, but after reading these reviews, I’m not taking any changes with my fur kids.

Our dog is now wearing her 2nd collar. She stays in the house at night when we’re home but during the day she roams through the weeds and woods. Until she started wearing this collar it was nothing to get 5-10 ticks a day off her. She hasn’t had any bad effects and she doesn’t have fleas or ticks. We highly recommend the Seresto collar.

I have used a Seresto Collar on my two dogs (one border collie and one collie cross) for the past 6 months as we live in a tick prone area. Neither dog has had any side effects and also neither dog has had a tick since wearing the collar. This has been an excellent purchase because my dogs were frequently getting ticks attached. I used to use Front Line but the Seresto collar is more effective – no irritation and no messy application.

Since putting collar on my toy poodle she has been scratching and scratching. Her ears are also red. I spoke with my vet, she was not sure. I have taken the collar off and her scratching has stopped. I will be sending a note to Bayer tonite.

Wow! I lost my 11 year old Beagle a few weeks ago. He was sick for about a month, started with loss of appetite, then when he did eat vomiting and diarrhea. Took him to our vet, then VSEC center. Said it was gastroenteritis, treated him with fluids and antibiotics but no improvement. Spent $$$$$ to no avail, finally had to put him to sleep. He had one of these collars on three months. I now believe this may have been the cause. Now my three year old Aussie started with diarrhea. After reading the above, just cut the collar off and going to give him a bath!

Seresto Collar – Very SERIOUS SFX from 6 month old large breed puppy! Within 2 days of use, puppy became very aggressive towards me, (lunging and biting) with seizure like activity for about a week. Called vet and vet said to put puppy down! I REFUSED!Sought elsewhere and found NOT behavioral issues, but Neurological issues from collar! Immediately took collar off and puppy back to normal, loving self. Contacted FDA, they referred me to EPA as collar considered an insecticide! Got refund back from vet BUT never used vet, again, either! Time for a petition against Bayer – Seresto Collar!!!

I agree regarding a petition against Bayer.
I had the collar on my 14yr old dog for almost 2 months when she started to get very sick.
Took her to the emergency room and they kept her for almost 5 days..ran alot of test and gave her a lot of antibiotics, which she is still on..she thanks God has recovered..but the doctor’s could not determine what cause her illness.I told them that she was fine until I put the collar on her..but they would not confirm that the illness came from the collar..I do feel otherwise though..I will never buy that collar again and Bayer should be sued..needless to say the collar was removed..

I have 3 cats & 1 dog. The collar does get rid of fleas, however 1 cat’s neck became raw & bloody. I had to remove the collar. The other 2 cats are ok with the collar. My miniature poodle just had a seizure last night. It scared the HELL out of me. I have read other peoples reports of seizures in their dogs. Once they removed the collar the dogs were ok. I will remove it from my dog & cats & will never use it again! It does work but at what cost to our animals?

My vet pushed this collar. My 100 pound chocolate lab had it on for a week was having spasms when sleeping. I said to my husband it seems like seizures. Then last night he tried to walk and couldn’t get his legs to work. We took him down and held him as he had a major seizure. Muscles stiff, eyes rolled back in his head, breathing heavy. The only thing new was this collar. I cut it off. I’m going to go throw it at vet after I get this poison off my dog.

after putting 4 of these collers on my 4 dogs all had diarhea and stopped eating ,upon advice from the vet all of the collers were removed and 3 of the dogs slowly returned to normal.one dog remains gravely ill and the vet tells us his immune system is shutting down due to the chemicals in the coller,i have writen to beyen and still i await a reply.iam many hundreds of euros out of pocket because of this product ,ie cost of usless coller and hundreds in vet bills.i feel this company should remove this product from the market and admit they have a problem.i look to them for my money and if i loose my dog they will regret ever selling this product

using the collar on my 12+ yr old bichon, have always used topspot with great results. She has recently lost some hearing, don’t know if its age-related. No rash or itching, also no fleas or ticks. But we never had any before with topspot either. Don’t know if I like it.

my pitbull had a Seresto collar placed on him because of the large amount of tics we have in upstate New York ; approximately one month later he developed a quarter size area below his left ear are that he lost his hair and then subsequently became open and bleeding sore within 12 hours. I took him immediately to the vet who said it was not the collar of course but a “hot spot”, he’s had a significant change in his behavior depressed , since being treated for his hotspot and he’s been attempting to take the collar off since the moment I placed it on. So he’s obviously smarter than I am!!! I will be taking that collar off tomorrow and giving the company a phone call I did ask the vet if that could be the problem and she said she said” absolutely not “and I’m a physician. I personally don’t like that children can pet the dogs with these collars on and possibly absorb these chemicals I think that’s an issue as well. femaleCEO@Twiller ( I will investigate )

STARTED USING SERESTO COLLAR ON OUR THREE DOGS SIX MONTHS AGO, GOT COLLARS FOR CATS FIVE MONTHS AGO. NO FLEAS, ONLY ONE TICK. WE RIDE OVER MANY ACRES, WOODS AND FIELDS, WITH DOGS SO ONE TICK IS FANTASTIC. CATS ARE IN AND OUT. CAT THAT HAD LOST MOST OF HIS HAIR TO FLEAS WHILE ON FRONTLINE NOW IS FULLY “CLOTHED”. ONE DOG HAD A SEIZURE A FEW WEEKS AGO BUT SHE HAD ALSO HAD ONE BEFORE USING THESE COLLARS, VET NOT CONCERNED AT THIS TIME AS SEIZURES CAN BE BROUGHT ON BY NUMBEROUS THINGS (OF COURSE I MONITOR HER CLOSELY). I DEFINITELY WILL BE REORDERING. NO ITCHING, SCRATCHING, CHEWING ON SELF–ALL IS CALM WITH OUR BELOVED PETS.

Bought 4 collars 1 month ago for 3 dogs and 1 cat. My Chihuahua is really sick now. Feeling really stupid that I didn’t figure it out sooner. She started acting super hyperactive, running around not settling down. Last night her neck was swelled, very large, red eyes, odd leg spasm’s, legs kicking out behind her oddly, 2 huge bumps under her skin on back legs, was chewing on back legs. I held her all night to calm her, today she was laying in same spot most of day, has not peed or pooped today, just threw up, headed to vet in morning. Cannot believe I poisoned my dog! Cut off all the collars last night, worried that the other pets could have bladder, renal problems because they are older, will be 13 years old this summer. Do not put these on your pets, who knows what this is doing to their organs even if you don’t see outward symptoms!!!!

I put the collar on for a short while like half hour and my dog started convulsing. As soon as we removed the collar and bathed him he was fine. It cannot be coincidence that all these owners report seizure type activity.

I have to believe that someone is paying most of you people off or there is a case of sheeple mass hysteria. I have used the Seresto collar on my Pyra-Dane for the last 4 months and NOT one flea or tick. We live in a heavily wooded area with lots of deer and before I used this collar I was using Advantix and found 6 ticks on her in one week. Since swithcing to Seresto not even one tick on her. A friend of ours who fosters dogs also uses Seresto and swears by it for her three dogs.

Hi ,I got my dog from the humane society 5yr ago she has had severe seizures from every flea product in liquid drop form on the market. I recently purchased you flea collar.seresto this is the only product I have found that works for my dog. Brandy has been seizure free for 2 months now.And flea free. Thank you so much. You have no idea what this means to me and my dog. Thank you very much.

I put a seresto collar on my 2 yr old Westie in January and he has had very loose stools ever since. Took him to the vet to rule out any parasite or abdominal issues. He has also lost weight while eating the same amount of food. He has no parasites, so after reading all these negative reviews, I am taking this collar OFF for good and going back to Advantage which I had no problems with whatsoever!

My mom’s dog had this same collar on. It has cause the dog to vomit, have diarrhea, stop eating,won’t drink fluids, and be lethargic. Liver failure had started. He has a very high white blood count. He is on meds to help with all this.I told my mom to remove the collar. I just knew that it was causing all of this. I had a cat one time that I had put a store bought collar on and he got very sick. So I had some experience with collars causing illnesses like this. I would not recommend putting any kind of flea and tick collar on your pets.

My experience using the Seresto collar has been pretty positive. Although strictly a non-clinical observation, my dogs have no fleas,flying insects seem to be repelled, and the Deer Tick seems to be effectively killed. I have found a few Wood ticks ( Dog Tick) that seemed to have lingered more than 48 hours though, I live in notorious Long Island and am out in fields often as I have working dogs.

My dog (Dasiy) is 4 years old I had her for two months and she had a SERESTO Flea and Tick colla,she ran away for 17 days, and when she came back she had ( 6 ) ticks in her, It cost me $80.00 I will never get another one , I will go back to the pills.

For those who experienced side effects, please report them to both your Vet and the EPA. This is the only way the manufacturer will be held to investigating and or doing anything about the side effects.

I bought this for my small Japanese Chin, who has had her first real experience with fleas. It worked almost immediately, I have not had one issue with her having sores or being ill. Now this is recent, I am wondering with a lot of these posts being older that if they changed the collar. I came here looking for chemical reactions for dogs with epilepsy.

I too listened to the advise from vet office. After wearing this collar for three days my lab had the most terrible night of watery diarrhea. I immediately took the collar off and looked up reviews stunned at what I’m reading. This is a terrible poison and nobody should use it on their pets.I hope my lab will be ok she’s only 8 months old

After using many natural flea remedies on my cocker/border collie cross, I chose to use an oral flea medication that caused my dog to have a huge hot spot in the middle of her back and she would break out in a rash over her entire body. She was miserable. Then I purchased a Serestor collar. She did not experience the hot spots or nor did I see a rash. I am now on collar #3 and am finding the collar to be less effective as I am now finding a few fleas when I bathe her.

In the beginning, I was very happy with this product as the release of the ingredients over a longer period of time seemed to supress the flea population.

My search will once again start for another product. Serestor was good while it was new but now is like all the other products-the fleas are building resistance to the ingredients.

I have had my dog wearing the Seresto collar for 2 months now–he has fleas and I have picked ticks off of him..Terrrible product and its ashame since it cost so much..DO NOT BUY THIS PRODUCT IT DOES NOT WORK………

Bought this collar for our cocker spaniel because we were taking a trip down south..he developed diarrhea which turn chronic..the vet put him on antibiotics for colitis and we’ve had him on that for 3 weeks now…finally after reading these posts I removed the collar and he is doing much better…NEVER AGAIN

After having collar on 7 month old lab for 7 days a rash developed behind his ears and quickly spread over his entire body, from behind his ears down his back and sides and down his legs. My vet could not diagnose the rash even after skin srapings and hair and folical cultures. The rash was very red almost like poison ivy and then dried out and became scaley and flaky and very irritating to him. After spending $70.00 for the collar it cost me 400 + dollars at the vet.

Seresto Collar, My German Shepherd has had this collar on for almost a month now and he still has problems with fleas and ticks. He has some hair loss from irritation and I took it off of him today and will be using other meds. Save your money and you pet from the problems it causes, I do not recommend this at all.

My 8 year old rott is doing better since I removed the collar on 7/11. I am having the vet do blood work and urine analysis to make sure nothing else is going on. She is more aware ,eating and drinking and moving around. This really scared me. I don’t recommend this for older dogs. It also a med that should be monitored closely on any animal.

My Shitzu, Max had a grand-mal seizure 3 mon. after wearing collar as well as chemical burns on his neck from the collar. Luckily I’m a nurse with some pharmaceutical education,so I knew right away to rip the collar off. I was so mad at myself for putting it on him. The chemicals in the Seresto collar are neurotoxic. Some dogs can tolerate it I guess & others can’t. However I would be willing to bet that out of all the dogs that are still wearing the collar if the owners would stop and think about some of their pets behaviors they would probably say they’re different for the worse. Please pay special attention to your pets that are still wearing this collar. I’m hoping they recall them soon. Whether Bayer agrees they’re toxic or not. After all money isn’t everything.

I have two dogs: one Lab mix 87 lbs and one Shih Tzu 14 lbs. Immediately after applying the Seresto collars, both dogs started itching, the Lab incessantly. I removed the collar for a few days and the itching stopped. I reapplied the collars. The Shih Tzu calmed down after a few days. The lab started itching incessantly again. I was hoping that in time, the itching would stop and all would be well, but it’s been a month and she has gotten no relief. I don’t notice signs of fleas, but I do notice signs of dry skin. I would like to return the collar for a refund, but don’t know if that’s possible. Based on my findings, I cannot recommend the Seresto flea collar.

I have a 9 year old Cairn Terrier named Micki I got a
Seresto Tick and Flean collar from the vet. Well after a
few weeks I thought my Dog was acting strange. I took her to the vet because she had loose stools and started spitting up. I was given antibiotics and nausea pills plus pro-biotics. I have been giving her the antibiotics, she would not eat the food with pro-biotics she rallied for 2 days and now she will not eat or drink water. I believe no one should use this collar too many side effect. I will bring her back to the Vet to put her down Hearts breaking

I have two dogs that I used the Seresto collar on. The West Highland Terrier was able to wear the collar without a problem. The Ori-pei who has food/environmental allergies developed a chemical burn on the underside of her neck along with a bright red rash (contact dermatitis) on the underside of her belly and legs. We live in an area with a very high rate of Lyme disease and both dogs have been treated in the past for tick borne illnesses. I thought the collars would be a huge help because the Frontline did not seem to even last a month on my dogs. Started back on the Frontline after waiting period and added a homeopathic lavender spray from my groomer. So far no ticks/fleas found on either dog.

Purchased this collar and put it on my 65 pound black lab mix. Within a few hours she started panting excessively. I took it off that evening. The panting stopped within a few hours. Tried to put it back on a few days later. Within 5 minutes the panting started again. My dog doesn’t get fleas but I’ve seen a few ticks on her. Not worth the risk in my opinion. Definitely returning to our vet for a refund.

The Seresto small dog collar caused my dog to bleed internally! I spent over $2500 and saw 3 different vets who could not figure out the problem. It wasn’t until I put the collar back on him and he got really sick again that we figured out what it was! He is a 2 year old 11 pound maltese mix. His symptoms were: did not want to drink, did not want to walk on leash, did not want to eat, vomited, had red rimmed watery eyes, bloody stools, would come crying to me in pain, restless. The blood tests showed internal bleeding and after a while pancreatitis. The only thing that worked finally was treating him with fluids and bathing and soaking him in water.

A few days after wearing seresto my dog started acting real weird. Her tail slid btw her legs and she walked hunched over and was frightened of everything. She started to scratch and bite at her back end area like something was in it. Her eyes started to have this glossy far away look and I thought she was going to attack me.

We live in South Fl. and have a English Springer Spaniel, we have battled fleas forever , trying everything under the sun to make them go away, we took a leap of faith by purchasing the Seresto Collar and within 24 hours our dog was flea free….we have never had any problems with the collar and bought one for our 1 year cat and she has had no problems…..I hate that a lot of people have had such horrible issues with this product….but I can honestly say the collar works just as it is supposed to.

While visiting NC my dog got infested with fleas and I went to a store where they sell pet products for cats and dogs.
The man told me this was the best thing and sold me the collar for $56.99 and a 6-pack of tablets called Capstar for $28.50
This was about two weeks ago. Well we have been home for almost a week and this morning my schnauzer did not even want to get out of his bed. I had met with some friends today and one suggested that I should probably take the collar off that it is harmful to liver and kidneys. When I got home I went to take it off and found he had a mass swelling under his neck the size of a half avocado. I removed it and I am praying that this clears up. They need to stop selling this poison!!!!!!!

Have a 10 year old Labrador and 2 year Chocolate Labradoodle that the collar works good for fleas and ticks. The only problem with the collar is it doesn’t last but only 5 to 6 months on the Labradoodle. I assume it is his thick coat of hair that I have to trim every 6 weeks. It is a good product for my dogs. I’ve used an internal pill product for my older dog in the past and stopped using it thinking it was causing him problems, but would never try to have it removed from the market, because my dog was sensitive to it.

About a month ago I used a seresto Flea collar that my vet recommended on my 9 year old cocker spaniel. Within a day or so he became lethargic, no energy, etc. I called the vet, they swore by the collar. I removed it immediately and within 24 hours my dog seemed back to normal. However, several weeks later he began to have problems walking and a spasm in his neck. He went for surgery and the surgeons said he also had spinal meningitis. Prior to this collar, his checkup was fine, blood work fine. I am convinced that this exposure caused neurological damage.He died right after surgery.

Wow, after reading these comments I am beginning to wonder if my shih-Tzu Charlie is suffering because of this collar. He is no spring chicken (10) but the last month he has been sick. It started out with him just not being himself. Charlie is playful, but we noticed he just laid around. His appetite did not exist but would drink water like it was going to run out. Then he started yelping VERY LOUD and his back legs were very weak. He looked very swollen to us. This all happened after I bathed him and waited a day to put his collar back on. He did not get any better so we took him to the vet thinking he may have a pinched nerve in his lower back. He couldn’t put his neck down and always had it up. The vet did a very extensive exam and noticed the things mentioned above. His right back leg seemed to be more favored than the left and his neck. If he lifted it up higher than it was, or lower he would yelp in pain. We were sent home with tramadol. So a week goes by and Charlie is getting worse so we go back to the vet. This is where they did 3 exams. He has no broken bones, no herniated disks, but did have a bladder stone. So they gave us a steroid, an antibiotic and another pain medicine as the tramadol was not touching the pain my poor Charlie was in. Nine days ago, I thought I would give him another bath because he was making progress. HE loves a bath!! Again, I waited until the next day to put the collar on him and it all started happening again. We have taken the collar off now. It has now been two weeks since he has been on the medicine. He was feeling much better before the second bath. I am going to give it a few more days, and if he is not better then we will be going back to the vet. We also have a pit who is an outside dog. He roams around on the farm and we got him the collar first. Has worked amazing for him and we have had NO problems. He even goes into the pond and walks it. This collar has been the only thing that has kept the ticks n fleas off of him. This was the reason why we got two more for our small dogs. Again, Pressy (corgi mix) has not shown ANY of these side effects. Only Charlie. The only key link here is he got sick after I bathed him and put the collar back on him the next day. He did have some vomiting prior to this, but again, I didn’t think anything about it. Really just hoping he gets better. I do not believe this collar is for all dogs.

I purchased the Seresto collar from my vet, but decided to wait until the weekend to put it on my dog so I could be be home to observe HER… just in case. Almost immediately after removing it from the package I began itching & tingling all over my arms. After putting it on my 23 lb. shihpoo, within minutes she started scratching like crazy , then frantically rolling around all over the sofa and floor. Lo & behold when I checked online re: Seresto “reactions, found this site and several others loaded with less than positive comments. Needless to say, the collar is now wrapped in plastic and back in the tin to be retuned to the vets ofc. Thank you all for your posts. They likely saved me from much worse problems than a few fleas. Sinserely, Jane in Richmond VA

We bought the collars for our 1 year old Chihuahuas. Only 1 came at first so we put it on the smaller dog (she is about 5lbs). We noticed our other dog not feeling well. She would shake and was lathergic and had lost her appetite for a day or two then felt better. The dog we put the collar on started having the same symptoms plus was scratching herself raw. I realized it must have been the collar after a few days and took it off and bathed both dogs. She started doing much better the very next day. We returned the collars and went back to using the drops with no issues.

Bought collars for our three dogs. Put them on and within, one hour our small westie/chihauhua mix started shaking and vomiting. Removing collars and calling Bayer for a refund. Wish I would have looked at reviews before purchasing.

Have been using Seresto Collars on all 6 of my dogs for about 2 -3 years. In that time have found NOT ONE FLEA on my dogs. There have been NO HEALTH ISSUES AT ALL. I have big dogs, and small dogs, none have had any problems. My vet recommended the collars to all of their clients, and report that they work great, even on farm dogs that live outside, like Great Pyrenees. No problems reported by anyone. So, I would recommend talking to your vet instead of believing anecdotal stories. Seresto works; and it’s safe.

I agree totally with Suzanne. I have 4 large dogs. All rescue dogs with problems quickly overcome with love and nutrition. Our lab/out has allergies to fleas. Her skin would blood in patches from tail, up the back to hips and chest. She was miserable. Laredo, a Shepard/wolf hybrid would get a severe ‘monkey butt’ from fleas. Wabash, a boxer/ American bulldog, had bumps and scabs from fleas about her hind section and Moses, Burmese Mountain Dog/American Bulldog w Heinz influence would lose his hair as if he was balding prematurely so his skin was more prevalent than fur. Each was treated monthly with Advantix and shots, daily flea pills and the once a month pill for heartworm prevention. The Central Florida atmosphere we live in was dramatic in the height of summer for all 4 dogs. We spent a fortune every month for our dogs to be miserable! I switched vets and tried to Seresta collar on Sasha (lab) 1st. Within 5 days she stopped all bleeding, regained her healthy coat and was a PRANCING PONY PUPPY again!! It was amazing. All four of our babies now wear the collar and look marvelous. I never thought they would be so happy and pain free from flea inflections. This collar is the best thing to ever happen in their lives. We are getting close to 7 months now of their second collar. I have been able to purchase the collars on eBay for $27 to $42 each. I highly recommend Seresta collars to all my pet living friends.

My vet recommended the Seresto collar for my two mini poodles. One of them already was dealing with a hot spot then got a bloody rash on her neck below her chin. I decided to remove and return the collars and got my money back from Petsmart. Then I read a LOT of reviews praising the collar, even one from a poodle owner and decided to order two from Drs. Foster and Smith. This time my dog’s hot spot had healed. After several days she developed the same bloody rash as before and I took the collar off. Later, she began to act strangely and desperately wanted to be held. I put chlothexidrine (the same cleanser I used for her hot spot) on the bloody rash and it seemed to help. But, she is still acting jerkily and strange, not like her usual self. My other dog doesn’t seem to be affected but after reading all the terrible effects other dog owners have had, decided to remove hers too. I hope to return them and get my money back. I will be taking my sick dog to the vet first thing tomorrow morning!

Used Seresto Collar on my 9 month old St. Mix. After 3 days caused seizure, lunging and biting behavior. 2 Neuro docs sed,”neurological”, not behavioral. Vet wanted to put my precious dog down. I refused!!! Took off Seresto collar immediately and absolutely back to her happy, calm self. HORRIBLE EXPERIENCE!!!

I purchased 2 of these for my dogs these collars were put on the first week 1 of my dogs had runny stools and urinated all over, this dog is fully trained not to potty in the home,i did not relate this to the collar, second week this dog was lethargic and fell to the floor and had a seizure. At that time i knew it was the collar i removed it withen 24 hours he was much better,oh he also was very agitated too. My second dog had a collar alao. Very anxious and had behaviors not as bad as my first. I lost a dog to flea and tick pill from seizures i thought the collar would be ok ITS NOT, I called Bayer and they are giving back to me the cost of these collars… I will now never put in or on my dogs any poisen for fleas may i add i sm 56 years old and all my dogs when i was young ,when my parents seen fleas they bathed them none of this toxic chemicals were around…….
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our dog has had it on now little over 3 weeks. he has no problems that people have mentioned. it works awesome. we have no fleas and he had them really bad. our dog is 16 months old long hair . no problems so far and if we don’t have any., I will put another one on in 7 months

I put the Seresto collar on my three dogs on January 1st. On the 5th one of my dogs became very ill and started to develop neurological problems. He went from a healthy active hunting dog to a dog that could barely stand up and lost all control of him back legs. We removed the collar immediately and took him straight to the vet. After many tests and blood work everything came back negative. He made recovery after a day of not having the collar on. Mt other two dogs have not had a reaction.

I used the collar for several months on my schnauzer and she developed trouble breathing. Took it off, threw it away and gave her a bath and she got better, but didn’t seem to feel good. Vet could not find anything wrong. Several months later she started hacking cough and couldn’t stop gaging and breathing very fast. Could not get it to stop. I had to put her to sleep.

Had my 8 yo Beagle develop lumps under the skin at the neck area, they were biopsied and found to be a pyogranulomas , now I’m finding vet cases where this has been associated with the chemical Imidacloprid found in seresto collars, Beagle has now got lumps in all area of his body legs,chest ,neck back, they grow until they rupture then drain for days , then start to dry out on the surface but lump is still there, local vet is baffled, we now have appointment at UW school for veterinary medicine . The lumps are very painful to touch, and dog is very lethargic , we are now on our 3rd set of antibiotics trying a combination of 2 this time with no help yet, we are hoping we can keep him stable enough to make to appointment still 10 days out. First time we ever used this collar, used frontline previously with no health issues, these collars were suppose to be better at killing fleas and ticks, just didn’t think I be fighting to save my dogs life also.

This is the second year with seresto on my 8 year old Rott and my cats. I had an infestation fleas in the house bought sprays from the vet. Hundreds spent on front line, pills, sprays, dips, bombs, and old wives tales. My animals have had no problems and the fleas are gone. Something that hasn’t happened in years with any product. I love Seresto!!!

I purchased a Seresto collar for my dog Ginger from Amazon. I noticed her fur had thinned around her neck shortly after putting the collar on her, but when I gave her a bath her fur began to come out in clumps all over! Now her previously soft fluffy fur is thin and coarse and dry. After wearing it for a week and a half she began to lose her appetite and grew very lethargic. She wouldn’t even eat treats which is very unusual for her. Today she started having vomiting and diarrhea. I took the collar off and getting ready to bathe her in Dawn and take her to the vet.

I am in cooler weather for the winter, so after the first 8 month use I skipped 6 months. I put collars back on each of my small (6 and 8 lb ) mutts and they have been flea and tick free without any side effects. I think the Seresto collar is great and would recommend.

A waste of $. I plan to go down to Petsmart in the AM. & essentially threaten to boycott them if they don’t refund me. Two months on Seresto, FLEA INFESTATION on my dog. I had my doubts. Oh well back to greasy First Shield.

I bough the Seresto flea collar for small dogs on Saturday. On Tuesday my 10 lb. Chiweenie became deathly ill. She started pooping and vomiting blood. She was lethargic and didn’t eat or drink. I took her to the vet and they thought she had been poisoned. We have not noticed her eating anything that would cause it but we doubted ourselves and thought maybe she got into something we didn’t know was poisonous. They told us to keep her hydrated and monitor her. It hit me that the only thing that we have done new to her is the Seresto collar. We took it off and gave her a bath in dawn and are praying it was the collar and we caught it in time. Has anyone else experienced bleeding like this?

Have my 11 year old lab currently in the icu getting prednisone and treatment for dangerously low platelets. On April 19 we had lab work and everything was normal. Purchased a Seresto collar and within a couple of months she is now on deaths door. Poisoned by the collar is suspect. A class action suit needs to be brought against Bayer, too many pets getting sick and dying not to mention the thousands of dollars spent at the Veterinarian. Disgusted that I didn’t read this site sooner.

A week or two after my 2 yr old American Pit started wearing the collar he began to shake his head. I didn’t think much about it. Last week his neck started to become very itchy. He would really lean into your hand when you touched his neck. Four weeks into wearing the collar the iris of his eyes turned red and he began coughing, hacking and gagging like he was choking on something and couldn’t cough it up. His breathing would become labored and his bark was muffled and horse sounding. During this whole ordeal, he was eating, drinking and able to use the bathroom fine. Took him to the vet and had xrays and found no blockages, nothing in the lungs and sent home with cough meds and anti-inflammatory. May have been a scratched esophagus?? After hitting the internet and reading reviews with similar problems, I took collar off and bathed him in dawn dish detergent several times to get all of the chemicals off. Within two hours his eyes cleared up, cough/hacking is subsiding slowly and is not as forceful. Vet called this morning to check on his progress. I told them about the collar and what I found. I was told it is a strong possibility that this is the cause. I asked about benedryl and was told not to give at this point and it may take a few days to get the chemical out of his body. I hope he will be okay! I bough the collar off amazon and my vet does not sell these collars. I have to do a follow up with vet in two days to report progress. I hope that this will help someone else!! So far my vet bill is over $200.00. Once he recovers I will try to contact Bayer as other have done.

Lost our dog same thing seizures loss of back legs wouldn’t wear or drink and couldn’t walk this is very hard to take being I was told it was safe for our dogs bought them for all 3 and lost our Bella other dogs don’t wear them any more

I have 2 Golden’s and an American Boxer. I put the collar on all 3 of them 6 weeks ago. My Male Golden developed scabs on the top of his head and cheeks and recently bad diarrhea ( I removed his collar 3 days ago when the diarrhea started and I made the connection) My Female Boxer developed blisters on her legs and paw pads, between her toes, brought her to the Vet and he said it was an allergy, possibly an Inhalation Allergy. Took me 24 hrs to figure out it was the collar. My other Golden has no symptoms of anything at all and was still wearing the collar until I read these comments 10 mins ago. Back to Frontline for my Crew!
I’ve had Zero problems with Fleas and Ticks ( I have a house in a Deer Populated Area) since using the collars, but my Dogs Heath is more important.
I believe the collar affects certain dogs, but not All dogs in a negative way, but from what I’ve experienced, 2 out of 3 of my dogs are allergic to it. Not a good ratio at all. I’ll be calling Bayer tomorrow.

I started using seresto last summer on my 2 long haired cats as topicals were not working on my 20 pound Maine coon. The flea infestation that was over running my cats lives came to an abrupt end and my cats have experienced to my knowledge no negative side effects. I also recommended this product to my in-laws for their 3 dogs, they too were experiencing a tough time with fleas in their yard and home and having had tried many treatments finally tried seresto and found their problems solved. They also have not reported any side effects as of yet.

I put the Soresto Collar on my 2 1/2 yr old chichuahua on 8/11 and on 9/5 she had a seizure, became very lethargic, shaking all over. Took her to the vet and thought maybe she had eaten a piece of onion. Put her on Probiotics and her condition worsened to the point where she actually snapped at me when I tried to give her her meds. Brought her back to the Vet and they ran all kinds of tests and discovered that her blood count was extremely low and her white cells were extremely high. Also her liver was swollen. After two days I read all of the reviews on this website and had them remove the collar immediately. She stopped vomiting, started eating very well and seemed to have perked up (within 24 hrs.). I contacted the company (Bayer) and they said they would refund my money on the collar as she must have some side effects from it. They also said for me to send my Vet Bills to the Refund department. (Which I plan on doing). Well I went and picked up my precious little girl today only to be given the very bad news. She has some form of Cancer (Leukemia) and has a month at the most. I can take her to Cornell University for a blood transfusion but it is not going to cure what is going on inside her Body. AND IT IS ALL BECAUSE I DIDN’T LISTEN TO MY GUT FEELINGS ABOUT NOT USING THIS COLLAR. I am hoping having the collar off she will get better and that the Vet has misdiagnosed her. If not – it is only a matter of time. Bayer Company is killing my precious little girl and they haven’t heard the last of me.

Used for my 3 dogs for the first time this year. My only complaint is that they didn’t last the 8 months they were advertised to. I’ve seen one tick and a few fleas since they started to become less effective after about 5-1/2 months. You never know how your dog will react to any chemicals you use on them. I just read an article the other day warning people off one of the flea treatments that were considered good by this website, so you never know.

This is my second time using the Seresto flea collars and have not had a problem with the product. The first time was 2015 and our dogs had fleas bad, bought these collars and haven’t seen a flea or tick. Bought them the second time when that eight months was up. We recommended it to my father in law for his Shih Tzu and he had no problems. We will be buying again when we need them again.

My two dogs had the Seresto flea collar for the entire 8 months. They were covered in fleas. The fleas disappeared. Never had any bad reactions, itching, anything! So these reviews are so shocking to me. But, after the 8 months I took them off and was eventually going to buy more bc my dogs are out in the woods a lot. Until I realized the collar had caused both of my dogs under their neck to lose a patch of hair. One of my dogs was red like a rash the other was just white and normal. Neither dog ever seems in pain or even tries to mess with their neck. The collars never bothered them until I saw this so I was very confused as to why the dogs didn’t itch or anything. Who knows! Anyone else with a similar situation?

This is the 2nd year I have used this collar for my dog.I had no problem the 1st year but now my dog has fleas.The collar is not due for replacement until Dec.I called Seresto consumer and spoke with a rep who advised me to do an “environmental check”which means check dog before he goes out and when he comes in.I did that and dog still scratches mostly at night. I called back and another rep advised me to take to vet to determine why dog is scratching.I said it’s because of the fleas.Rep stated it may not be fleas.They just give you the run around when their product doesn’t work.I will never buy again. very dissatisfied. did not offer to replace collar.

I am furious!My vet recommended arrestor and told me nothing about reactions. After wearing this collar for four days, she started scratching furiously. The next day she became lethargic and stopped eating. After reading the reviews here, I took that collar off immediately and apologized tearfully to my labradoodle. I will be taking that poison back to the vet for a refund and then I’m going to fire them for their carelessness with my baby’s health!

My two dogs and two cats (all rescues, all loved and well cared for) have worn Seresto collars without incident or ill effect for two years. They have effectively repelled ticks and fleas. When my cat lost his collar on one of his jaunts outside, Bayer promptly replaced it-it is their policy to replace a purchased collar one time, which I thought was very fair. Not sure why all the drama above (I apologized tearfully to my Labradoodle?!?!?! Puh-leeze). -it in no way represents the experience we have had with this product-and no one cares for their pets more than we do.

On a Thursday, I put Seresto collars on my 2 senior small dogs because of my vets recommendation. By Saturday they both had diarrhea. By Sunday evening, I took the collars off the dogs. By Monday afternoon, the diarrhea had stopped in both dogs. I told my vet about the reaction and she was surprised and recommended I put the collars back on in a week. I will not do so. Like with some people to medications, some dogs will have reactions and experience side effects, some will not. So if your dog or cat shows a reaction to the Seresto collar, you probably should remove the collar immediately. I plan to use weekly baths and a holistic approach to controlling the fleas and ticks on my 2 dogs.

bought a Seresto collar for my yorker because it was recommended by the Vet. The second day of wearing it my dog had a bad reaction. She was scratching so much i taught she had fleas. When I took the collar off, her neck was red and raw, poor thing. I now refuse to put it back on.

I wouldn’t recommend anyone buying a Seresto collar. So I went back to the Vet with my yorker to ask for my money back. Receptionist said i had to call the company.

Hi, I am wondering if anyone has had any problems with lumps showing up on their dogs after using the Seresto collar for 2 years? I have a 7 yr old Labrador & I 1st noticed a soft slump on ahis shoulder. Not long after that I found another on his other shoulder. I feel small ones on his neck/chest about 5″ down from the collar.
I stopped using the collar 10months ago and the 1st lump is no longer growing. It even seems to have shrunk in size. Vet said last year the lumps were fatty tumors.
I know it’s common in labs to get fatty tumors, but just trying to find out if anyone else has seen a connection between lumps & the Seresto collar. Bauer said they have had no complaints of this type. They have called me twice since to see if I am still having problems.
Thanks for any info any of you can give me!

We are on our second collar for pit/mix. I love the effectiveness against ticks. We live in CT and there is a real problem. Having said this my dog has been severely itchy with a terrible rash on his stomach. No change in diet or any other factor. He has also seemed “off”, a bit depressed. Took the colar off and gave him a bath this am. I’ll give it a week and see how he does.

I have used the collars for a couple of years successfully on my dog–and first 2 cats then 3. This year I purchased the collars from Walmart and they failed–I called Bayer they insisted that they don’t supply Walmart so they must be fake–however they were in the proper tins, the tin was sealed and the collar sealed in the bag inside–and the Bayer paperwork/instruction sheet was in there too. Regardless they were not listening when I explained they were failing and my dog–who is allergic to fleas–hair was falling out and scratching non stop–and my cats were covered in fleas. I got a lecture on the fleas life cycle and all the ways they can enter my home–including jumping through screens on my open windows. When I explained that I have sky lights and no doors or windows are open as there isn’t enough of them to make a difference–and this is in later February in IL. they wouldn’t be open that time of year anyway well they just continued to insist I had it on wrong–not sure how many ways there are to put on a collar but I assured her they were snug and only 1 finger could fit between the cats neck and the collar–nope they insisted it wasn’t their fault. I bought a second round of collars from an online retailer that I frequently use and had no better luck. So I am done with these collars. I did not have sick animals from them, no burns or anything they simply don’t work. I am now in the process of changing flea meds and trying to clean up my home–we do not have fleas jumping on us but I see them on the cat tower now and then so they must be here. Initially the collars worked well…but not any more. They also claim that fleas do not build up a resistance to these products–which I if that is true I am not sure why we have products that existed previously but they now have upgraded formulas. Bayer tho was no help to me, didn’t offer a refund and in fact insisted it was my fault they were not working—and my cats do not go outside ever. The dog is now on comfortis and I am considering a new topical for the cats.